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* Copyright 2005, JBoss Inc., and individual contributors as indicated
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.jboss.aop.advice;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import org.jboss.aop.Advised;
import org.jboss.aop.Advisor;
import org.jboss.aop.ClassAdvisor;
import org.jboss.aop.InstanceAdvisor;
import org.jboss.aop.joinpoint.CallerInvocation;
import org.jboss.aop.joinpoint.ConstructorCalledByMethodJoinpoint;
import org.jboss.aop.joinpoint.ConstructorJoinpoint;
import org.jboss.aop.joinpoint.FieldJoinpoint;
import org.jboss.aop.joinpoint.Invocation;
import org.jboss.aop.joinpoint.Joinpoint;
import org.jboss.aop.joinpoint.MethodCalledByMethodJoinpoint;
import org.jboss.aop.joinpoint.MethodJoinpoint;
import org.jboss.aop.proxy.container.ClassProxyContainer;
import org.jboss.aop.proxy.container.ContainerProxyMethodInvocation;
/**
* Comment
*
* @author <a href="mailto:bill@jboss.org">Bill Burke</a>
* @version $Revision: 69301 $
*/
public class PerJoinpointAdvice extends AbstractAdvice
{
public static Interceptor createInterceptor(Advisor advisor, Joinpoint joinpoint, AspectDefinition def, String adviceName) throws Exception
{
if (joinpoint instanceof MethodJoinpoint)
{
MethodJoinpoint method = (MethodJoinpoint) joinpoint;
if (Modifier.isStatic(method.getMethod().getModifiers()))
{
return PerVmAdvice.generateInterceptor(joinpoint, def.getFactory().createPerJoinpoint(advisor, joinpoint), adviceName);
}
}
else if (joinpoint instanceof ConstructorJoinpoint)
{
return PerVmAdvice.generateInterceptor(joinpoint, def.getFactory().createPerJoinpoint(advisor, joinpoint), adviceName);
}
else if (joinpoint instanceof MethodCalledByMethodJoinpoint)
{
MethodCalledByMethodJoinpoint method = (MethodCalledByMethodJoinpoint) joinpoint;
if (Modifier.isStatic(method.getCalling().getModifiers()))
{
return PerVmAdvice.generateInterceptor(joinpoint, def.getFactory().createPerJoinpoint(advisor, joinpoint), adviceName);
}
}
else if (joinpoint instanceof ConstructorCalledByMethodJoinpoint)
{
ConstructorCalledByMethodJoinpoint method = (ConstructorCalledByMethodJoinpoint) joinpoint;
if (Modifier.isStatic(method.getCalling().getModifiers()))
{
return PerVmAdvice.generateInterceptor(joinpoint, def.getFactory().createPerJoinpoint(advisor, joinpoint), adviceName);
}
}
else if (joinpoint instanceof FieldJoinpoint)
{
FieldJoinpoint field = (FieldJoinpoint) joinpoint;
if (Modifier.isStatic(field.getField().getModifiers()))
{
ClassAdvisor classAdvisor = (ClassAdvisor) advisor;
Object aspect = classAdvisor.getFieldAspect(field, def);
return PerVmAdvice.generateInterceptor(joinpoint, aspect, adviceName);
}
}
return new PerJoinpointAdvice(adviceName, def, advisor, joinpoint);
}
private boolean initialized = false;
AspectDefinition aspectDefinition;
Joinpoint joinpoint;
public PerJoinpointAdvice(String adviceName, AspectDefinition a, Advisor advisor, Joinpoint joinpoint)
{
aspectDefinition = a;
this.adviceName = adviceName;
advisor.addPerInstanceJoinpointAspect(joinpoint, a);
this.joinpoint = joinpoint;
}
public String getName()
{
return aspectDefinition.getName() + "." + adviceName;
}
public Object invoke(Invocation invocation) throws Throwable
{
Object aspect = null;
if (invocation instanceof CallerInvocation)
{
//TODO: Naive implementation. Ideally callers should be able to look up the aspect by target instance
//to make sure that there is only one instance per target rather than caller
Object callingObject = ((CallerInvocation) invocation).getCallingObject();
if (callingObject == null) return invocation.invokeNext(); // called from static method
Advised advised = (Advised) callingObject;
InstanceAdvisor advisor = advised._getInstanceAdvisor();
aspect = advisor.getPerInstanceJoinpointAspect(joinpoint, aspectDefinition);
}
else
{
Object targetObject = invocation.getTargetObject();
if (targetObject == null) return invocation.invokeNext(); // static method call or static field call
InstanceAdvisor instanceAdvisor = null;
if (targetObject instanceof Advised)
{
Advised advised = (Advised) targetObject;
instanceAdvisor = advised._getInstanceAdvisor();
}
else
{
Advisor advisor = invocation.getAdvisor();
if (advisor == null)
{
return invocation.invokeNext();
}
else if (advisor instanceof InstanceAdvisor)
{
instanceAdvisor = (InstanceAdvisor) advisor;
}
else if (advisor instanceof ClassProxyContainer && invocation instanceof ContainerProxyMethodInvocation)
{
ContainerProxyMethodInvocation pi = (ContainerProxyMethodInvocation)invocation;
instanceAdvisor = pi.getProxy().getInstanceAdvisor();
}
else
{
return invocation.invokeNext();
}
}
aspect = instanceAdvisor.getPerInstanceJoinpointAspect(joinpoint, aspectDefinition);
}
if (!initialized)
{
init(adviceName, aspect.getClass());
initialized = true;
}
Method advice = resolveAdvice(invocation);
Object[] args = {invocation};
try
{
return advice.invoke(aspect, args);
}
catch (InvocationTargetException e)
{
throw e.getCause(); //To change body of catch statement use Options | File Templates.
}
}
@Override
public Object getAspectInstance()
{
throw new RuntimeException("Use getAspectInstance(InstanceAdvisor instanceAdvisor) instead");
}
public Object getAspectInstance(InstanceAdvisor instanceAdvisor)
{
return instanceAdvisor.getPerInstanceJoinpointAspect(joinpoint, aspectDefinition);
}
}